CreateQuery hourly (children 4)
 Identifier hourly
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration hour (children 1)
    DataType datetime
   ColumnDeclaration metric.names (children 1)
    DataType Array (children 1)
     ExpressionList (children 1)
      DataType String
   ColumnDeclaration metric.values (children 1)
    DataType Array (children 1)
     ExpressionList (children 1)
      DataType Int64
 Storage definition (children 1)
  Function Memory
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 1)
    ExpressionList (children 3)
     Literal \'2020-01-01\'
     Literal Array_[\'a\', \'b\']
     Literal Array_[UInt64_1, UInt64_2]
